The hypocotyl is situated inbetween the root and the cotyledons. The hyopcotyl look similar in both Scots pine and Lodgepole pine. It is important to know from which cells roots form when rooting methods are developed. Thereby it is possible to concentrate on those cells (the green cells on the picture). I have drawn a map of the hypocotyl to be able to describe the changes that occur at different treatments.